Numerical Study of Flow and Noise Control Mechanism of Shape-Optimized Series Cylinder
Publication: Journal of Aerospace Engineering
Volume 37, Issue 6
Abstract
The study addresses the critical issue of noise generation attributed to airflow around cylinders and its regulation, a subject of great significance in a range of engineering applications. This paper uses computational fluid dynamics (CFD) in conjunction with acoustic analogy to evaluate the potential of elliptical cylinder configurations to enhance aerodynamic performance and mitigate aerodynamic noise. The analysis focuses on the tandem cylinder, which is a simplified representation of aircraft landing gear, and the mechanism for noise suppression associated with elliptical cylinders. The findings demonstrate the significant influence of elliptical cylinder designs on aerodynamic performance and noise reduction. Specifically, these designs exhibit a capacity to effectively reduce the average drag coefficient and proficiently suppress fluctuations in the lift coefficient, thereby resulting in an overall reduction of noise production by the elliptical cylinder. To investigate the underlying mechanisms of noise suppression, this study assessed the process of vorticity generation around the surface of the elliptical cylinder, and found a profound decrease in the distribution of vorticity on the elliptical cylinder’s surface, accompanied by a remarkable attenuation of the velocity and boundary surface pressure distribution. These changes result in a significant reduction in vorticity generation in the vicinity of the elliptical cylinder wall. These changes directly precipitate a significant contraction of the distribution of vortex structures in the wake of the elliptical cylinder, particularly impacting large-scale vortex structures. Therefore, the noise suppression mechanism proposed for the elliptical cylinder can effectively mitigate aerodynamic noise.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors gratefully acknowledge the support of the National Natural Science Foundation of China (No. 12372256).
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Information & Authors
Information
Published In
Journal of Aerospace Engineering
Volume 37 • Issue 6 • November 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Dec 15, 2023
Accepted: Apr 3, 2024
Published online: Aug 13, 2024
Published in print: Nov 1, 2024
Discussion open until: Jan 13, 2025
ASCE Technical Topics:
- Aerodynamics
- Aerospace engineering
- Analysis (by type)
- Business management
- Computational fluid dynamics technique
- Continuum mechanics
- Cylinders
- Disaster risk management
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering mechanics
- Environmental engineering
- Fluid dynamics
- Fluid mechanics
- Geometry
- Hydraulic engineering
- Hydrologic engineering
- Mathematics
- Mitigation and remediation
- Noise pollution
- Numerical analysis
- Pollution
- Practice and Profession
- Solid mechanics
- Velocity distribution
- Water and water resources
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